[linux.git] / fs / stat.c

/*
 *  linux/fs/stat.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */

#include <linux/module.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/file.h>
#include <linux/highuid.h>
#include <linux/fs.h>
#include <linux/namei.h>
#include <linux/security.h>
#include <linux/syscalls.h>
#include <linux/pagemap.h>

#include <asm/uaccess.h>
#include <asm/unistd.h>

void generic_fillattr(struct inode *inode, struct kstat *stat)
{
	stat->dev = inode->i_sb->s_dev;
	stat->ino = inode->i_ino;
	stat->mode = inode->i_mode;
	stat->nlink = inode->i_nlink;
	stat->uid = inode->i_uid;
	stat->gid = inode->i_gid;
	stat->rdev = inode->i_rdev;
	stat->atime = inode->i_atime;
	stat->mtime = inode->i_mtime;
	stat->ctime = inode->i_ctime;
	stat->size = i_size_read(inode);
	stat->blocks = inode->i_blocks;
	stat->blksize = (1 << inode->i_blkbits);
}

EXPORT_SYMBOL(generic_fillattr);

int vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
{
	struct inode *inode = dentry->d_inode;
	int retval;

	retval = security_inode_getattr(mnt, dentry);
	if (retval)
		return retval;

	if (inode->i_op->getattr)
		return inode->i_op->getattr(mnt, dentry, stat);

	generic_fillattr(inode, stat);
	return 0;
}

EXPORT_SYMBOL(vfs_getattr);

int vfs_stat_fd(int dfd, char __user *name, struct kstat *stat)
{
	struct nameidata nd;
	int error;

	error = __user_walk_fd(dfd, name, LOOKUP_FOLLOW, &nd);
	if (!error) {
		error = vfs_getattr(nd.mnt, nd.dentry, stat);
		path_release(&nd);
	}
	return error;
}

int vfs_stat(char __user *name, struct kstat *stat)
{
	return vfs_stat_fd(AT_FDCWD, name, stat);
}

EXPORT_SYMBOL(vfs_stat);

int vfs_lstat_fd(int dfd, char __user *name, struct kstat *stat)
{
	struct nameidata nd;
	int error;

	error = __user_walk_fd(dfd, name, 0, &nd);
	if (!error) {
		error = vfs_getattr(nd.mnt, nd.dentry, stat);
		path_release(&nd);
	}
	return error;
}

int vfs_lstat(char __user *name, struct kstat *stat)
{
	return vfs_lstat_fd(AT_FDCWD, name, stat);
}

EXPORT_SYMBOL(vfs_lstat);

int vfs_fstat(unsigned int fd, struct kstat *stat)
{
	struct file *f = fget(fd);
	int error = -EBADF;

	if (f) {
		error = vfs_getattr(f->f_path.mnt, f->f_path.dentry, stat);
		fput(f);
	}
	return error;
}

EXPORT_SYMBOL(vfs_fstat);

#ifdef __ARCH_WANT_OLD_STAT

/*
 * For backward compatibility?  Maybe this should be moved
 * into arch/i386 instead?
 */
static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
{
	static int warncount = 5;
	struct __old_kernel_stat tmp;
	
	if (warncount > 0) {
		warncount--;
		printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
			current->comm);
	} else if (warncount < 0) {
		/* it's laughable, but... */
		warncount = 0;
	}

	memset(&tmp, 0, sizeof(struct __old_kernel_stat));
	tmp.st_dev = old_encode_dev(stat->dev);
	tmp.st_ino = stat->ino;
	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
		return -EOVERFLOW;
	tmp.st_mode = stat->mode;
	tmp.st_nlink = stat->nlink;
	if (tmp.st_nlink != stat->nlink)
		return -EOVERFLOW;
	SET_UID(tmp.st_uid, stat->uid);
	SET_GID(tmp.st_gid, stat->gid);
	tmp.st_rdev = old_encode_dev(stat->rdev);
#if BITS_PER_LONG == 32
	if (stat->size > MAX_NON_LFS)
		return -EOVERFLOW;
#endif	
	tmp.st_size = stat->size;
	tmp.st_atime = stat->atime.tv_sec;
	tmp.st_mtime = stat->mtime.tv_sec;
	tmp.st_ctime = stat->ctime.tv_sec;
	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
}

asmlinkage long sys_stat(char __user * filename, struct __old_kernel_stat __user * statbuf)
{
	struct kstat stat;
	int error = vfs_stat_fd(AT_FDCWD, filename, &stat);

	if (!error)
		error = cp_old_stat(&stat, statbuf);

	return error;
}
asmlinkage long sys_lstat(char __user * filename, struct __old_kernel_stat __user * statbuf)
{
	struct kstat stat;
	int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);

	if (!error)
		error = cp_old_stat(&stat, statbuf);

	return error;
}
asmlinkage long sys_fstat(unsigned int fd, struct __old_kernel_stat __user * statbuf)
{
	struct kstat stat;
	int error = vfs_fstat(fd, &stat);

	if (!error)
		error = cp_old_stat(&stat, statbuf);

	return error;
}

#endif /* __ARCH_WANT_OLD_STAT */

static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
{
	struct stat tmp;

#if BITS_PER_LONG == 32
	if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
		return -EOVERFLOW;
#else
	if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
		return -EOVERFLOW;
#endif

	memset(&tmp, 0, sizeof(tmp));
#if BITS_PER_LONG == 32
	tmp.st_dev = old_encode_dev(stat->dev);
#else
	tmp.st_dev = new_encode_dev(stat->dev);
#endif
	tmp.st_ino = stat->ino;
	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
		return -EOVERFLOW;
	tmp.st_mode = stat->mode;
	tmp.st_nlink = stat->nlink;
	if (tmp.st_nlink != stat->nlink)
		return -EOVERFLOW;
	SET_UID(tmp.st_uid, stat->uid);
	SET_GID(tmp.st_gid, stat->gid);
#if BITS_PER_LONG == 32
	tmp.st_rdev = old_encode_dev(stat->rdev);
#else
	tmp.st_rdev = new_encode_dev(stat->rdev);
#endif
#if BITS_PER_LONG == 32
	if (stat->size > MAX_NON_LFS)
		return -EOVERFLOW;
#endif	
	tmp.st_size = stat->size;
	tmp.st_atime = stat->atime.tv_sec;
	tmp.st_mtime = stat->mtime.tv_sec;
	tmp.st_ctime = stat->ctime.tv_sec;
#ifdef STAT_HAVE_NSEC
	tmp.st_atime_nsec = stat->atime.tv_nsec;
	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
#endif
	tmp.st_blocks = stat->blocks;
	tmp.st_blksize = stat->blksize;
	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
}

asmlinkage long sys_newstat(char __user *filename, struct stat __user *statbuf)
{
	struct kstat stat;
	int error = vfs_stat_fd(AT_FDCWD, filename, &stat);

	if (!error)
		error = cp_new_stat(&stat, statbuf);

	return error;
}

asmlinkage long sys_newlstat(char __user *filename, struct stat __user *statbuf)
{
	struct kstat stat;
	int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);

	if (!error)
		error = cp_new_stat(&stat, statbuf);

	return error;
}

#if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
asmlinkage long sys_newfstatat(int dfd, char __user *filename,
				struct stat __user *statbuf, int flag)
{
	struct kstat stat;
	int error = -EINVAL;

	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
		goto out;

	if (flag & AT_SYMLINK_NOFOLLOW)
		error = vfs_lstat_fd(dfd, filename, &stat);
	else
		error = vfs_stat_fd(dfd, filename, &stat);

	if (!error)
		error = cp_new_stat(&stat, statbuf);

out:
	return error;
}
#endif

asmlinkage long sys_newfstat(unsigned int fd, struct stat __user *statbuf)
{
	struct kstat stat;
	int error = vfs_fstat(fd, &stat);

	if (!error)
		error = cp_new_stat(&stat, statbuf);

	return error;
}

asmlinkage long sys_readlinkat(int dfd, const char __user *path,
				char __user *buf, int bufsiz)
{
	struct nameidata nd;
	int error;

	if (bufsiz <= 0)
		return -EINVAL;

	error = __user_walk_fd(dfd, path, 0, &nd);
	if (!error) {
		struct inode * inode = nd.dentry->d_inode;

		error = -EINVAL;
		if (inode->i_op && inode->i_op->readlink) {
			error = security_inode_readlink(nd.dentry);
			if (!error) {
				touch_atime(nd.mnt, nd.dentry);
				error = inode->i_op->readlink(nd.dentry, buf, bufsiz);
			}
		}
		path_release(&nd);
	}
	return error;
}

asmlinkage long sys_readlink(const char __user *path, char __user *buf,
				int bufsiz)
{
	return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
}


/* ---------- LFS-64 ----------- */
#ifdef __ARCH_WANT_STAT64

static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
{
	struct stat64 tmp;

	memset(&tmp, 0, sizeof(struct stat64));
#ifdef CONFIG_MIPS
	/* mips has weird padding, so we don't get 64 bits there */
	if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
		return -EOVERFLOW;
	tmp.st_dev = new_encode_dev(stat->dev);
	tmp.st_rdev = new_encode_dev(stat->rdev);
#else
	tmp.st_dev = huge_encode_dev(stat->dev);
	tmp.st_rdev = huge_encode_dev(stat->rdev);
#endif
	tmp.st_ino = stat->ino;
	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
		return -EOVERFLOW;
#ifdef STAT64_HAS_BROKEN_ST_INO
	tmp.__st_ino = stat->ino;
#endif
	tmp.st_mode = stat->mode;
	tmp.st_nlink = stat->nlink;
	tmp.st_uid = stat->uid;
	tmp.st_gid = stat->gid;
	tmp.st_atime = stat->atime.tv_sec;
	tmp.st_atime_nsec = stat->atime.tv_nsec;
	tmp.st_mtime = stat->mtime.tv_sec;
	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	tmp.st_ctime = stat->ctime.tv_sec;
	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	tmp.st_size = stat->size;
	tmp.st_blocks = stat->blocks;
	tmp.st_blksize = stat->blksize;
	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
}

asmlinkage long sys_stat64(char __user * filename, struct stat64 __user * statbuf)
{
	struct kstat stat;
	int error = vfs_stat(filename, &stat);

	if (!error)
		error = cp_new_stat64(&stat, statbuf);

	return error;
}
asmlinkage long sys_lstat64(char __user * filename, struct stat64 __user * statbuf)
{
	struct kstat stat;
	int error = vfs_lstat(filename, &stat);

	if (!error)
		error = cp_new_stat64(&stat, statbuf);

	return error;
}
asmlinkage long sys_fstat64(unsigned long fd, struct stat64 __user * statbuf)
{
	struct kstat stat;
	int error = vfs_fstat(fd, &stat);

	if (!error)
		error = cp_new_stat64(&stat, statbuf);

	return error;
}

asmlinkage long sys_fstatat64(int dfd, char __user *filename,
			       struct stat64 __user *statbuf, int flag)
{
	struct kstat stat;
	int error = -EINVAL;

	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
		goto out;

	if (flag & AT_SYMLINK_NOFOLLOW)
		error = vfs_lstat_fd(dfd, filename, &stat);
	else
		error = vfs_stat_fd(dfd, filename, &stat);

	if (!error)
		error = cp_new_stat64(&stat, statbuf);

out:
	return error;
}
#endif /* __ARCH_WANT_STAT64 */

void inode_add_bytes(struct inode *inode, loff_t bytes)
{
	spin_lock(&inode->i_lock);
	inode->i_blocks += bytes >> 9;
	bytes &= 511;
	inode->i_bytes += bytes;
	if (inode->i_bytes >= 512) {
		inode->i_blocks++;
		inode->i_bytes -= 512;
	}
	spin_unlock(&inode->i_lock);
}

EXPORT_SYMBOL(inode_add_bytes);

void inode_sub_bytes(struct inode *inode, loff_t bytes)
{
	spin_lock(&inode->i_lock);
	inode->i_blocks -= bytes >> 9;
	bytes &= 511;
	if (inode->i_bytes < bytes) {
		inode->i_blocks--;
		inode->i_bytes += 512;
	}
	inode->i_bytes -= bytes;
	spin_unlock(&inode->i_lock);
}

EXPORT_SYMBOL(inode_sub_bytes);

loff_t inode_get_bytes(struct inode *inode)
{
	loff_t ret;

	spin_lock(&inode->i_lock);
	ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
	spin_unlock(&inode->i_lock);
	return ret;
}

EXPORT_SYMBOL(inode_get_bytes);

void inode_set_bytes(struct inode *inode, loff_t bytes)
{
	/* Caller is here responsible for sufficient locking
	 * (ie. inode->i_lock) */
	inode->i_blocks = bytes >> 9;
	inode->i_bytes = bytes & 511;
}

EXPORT_SYMBOL(inode_set_bytes);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/stat.c
	3	*
	4	* Copyright (C) 1991, 1992 Linus Torvalds
	5	*/
	6
1da177e4 LT	7	#include <linux/module.h>
	8	#include <linux/mm.h>
	9	#include <linux/errno.h>
	10	#include <linux/file.h>
1da177e4 LT	11	#include <linux/highuid.h>
	12	#include <linux/fs.h>
	13	#include <linux/namei.h>
	14	#include <linux/security.h>
	15	#include <linux/syscalls.h>
ba52de12	16	#include <linux/pagemap.h>
1da177e4 LT	17
	18	#include <asm/uaccess.h>
	19	#include <asm/unistd.h>
	20
	21	void generic_fillattr(struct inode inode, struct kstat stat)
	22	{
	23	stat->dev = inode->i_sb->s_dev;
	24	stat->ino = inode->i_ino;
	25	stat->mode = inode->i_mode;
	26	stat->nlink = inode->i_nlink;
	27	stat->uid = inode->i_uid;
	28	stat->gid = inode->i_gid;
	29	stat->rdev = inode->i_rdev;
	30	stat->atime = inode->i_atime;
	31	stat->mtime = inode->i_mtime;
	32	stat->ctime = inode->i_ctime;
	33	stat->size = i_size_read(inode);
	34	stat->blocks = inode->i_blocks;
ba52de12	35	stat->blksize = (1 << inode->i_blkbits);
1da177e4 LT	36	}
	37
	38	EXPORT_SYMBOL(generic_fillattr);
	39
	40	int vfs_getattr(struct vfsmount mnt, struct dentry dentry, struct kstat *stat)
	41	{
	42	struct inode *inode = dentry->d_inode;
	43	int retval;
	44
	45	retval = security_inode_getattr(mnt, dentry);
	46	if (retval)
	47	return retval;
	48
	49	if (inode->i_op->getattr)
	50	return inode->i_op->getattr(mnt, dentry, stat);
	51
	52	generic_fillattr(inode, stat);
1da177e4 LT	53	return 0;
	54	}
	55
	56	EXPORT_SYMBOL(vfs_getattr);
	57
5590ff0d	58	int vfs_stat_fd(int dfd, char __user name, struct kstat stat)
1da177e4 LT	59	{
	60	struct nameidata nd;
	61	int error;
	62
5590ff0d	63	error = __user_walk_fd(dfd, name, LOOKUP_FOLLOW, &nd);
1da177e4 LT	64	if (!error) {
	65	error = vfs_getattr(nd.mnt, nd.dentry, stat);
	66	path_release(&nd);
	67	}
	68	return error;
	69	}
	70
5590ff0d UD	71	int vfs_stat(char __user name, struct kstat stat)
	72	{
	73	return vfs_stat_fd(AT_FDCWD, name, stat);
	74	}
	75
1da177e4 LT	76	EXPORT_SYMBOL(vfs_stat);
1da177e4 LT	77
5590ff0d	78	int vfs_lstat_fd(int dfd, char __user name, struct kstat stat)
1da177e4 LT	79	{
	80	struct nameidata nd;
	81	int error;
	82
5590ff0d	83	error = __user_walk_fd(dfd, name, 0, &nd);
1da177e4 LT	84	if (!error) {
	85	error = vfs_getattr(nd.mnt, nd.dentry, stat);
	86	path_release(&nd);
	87	}
	88	return error;
	89	}
	90
5590ff0d UD	91	int vfs_lstat(char __user name, struct kstat stat)
	92	{
	93	return vfs_lstat_fd(AT_FDCWD, name, stat);
	94	}
	95
1da177e4 LT	96	EXPORT_SYMBOL(vfs_lstat);
	97
	98	int vfs_fstat(unsigned int fd, struct kstat *stat)
	99	{
	100	struct file *f = fget(fd);
	101	int error = -EBADF;
	102
	103	if (f) {
0f7fc9e4	104	error = vfs_getattr(f->f_path.mnt, f->f_path.dentry, stat);
1da177e4 LT	105	fput(f);
	106	}
	107	return error;
	108	}
	109
	110	EXPORT_SYMBOL(vfs_fstat);
	111
	112	#ifdef __ARCH_WANT_OLD_STAT
	113
	114	/*
	115	* For backward compatibility? Maybe this should be moved
	116	* into arch/i386 instead?
	117	*/
	118	static int cp_old_stat(struct kstat stat, struct __old_kernel_stat __user statbuf)
	119	{
	120	static int warncount = 5;
	121	struct __old_kernel_stat tmp;
	122
	123	if (warncount > 0) {
	124	warncount--;
	125	printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
	126	current->comm);
	127	} else if (warncount < 0) {
	128	/* it's laughable, but... */
	129	warncount = 0;
	130	}
	131
	132	memset(&tmp, 0, sizeof(struct __old_kernel_stat));
	133	tmp.st_dev = old_encode_dev(stat->dev);
	134	tmp.st_ino = stat->ino;
afefdbb2 DH	135	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	136	return -EOVERFLOW;
1da177e4 LT	137	tmp.st_mode = stat->mode;
	138	tmp.st_nlink = stat->nlink;
	139	if (tmp.st_nlink != stat->nlink)
	140	return -EOVERFLOW;
	141	SET_UID(tmp.st_uid, stat->uid);
	142	SET_GID(tmp.st_gid, stat->gid);
	143	tmp.st_rdev = old_encode_dev(stat->rdev);
	144	#if BITS_PER_LONG == 32
	145	if (stat->size > MAX_NON_LFS)
	146	return -EOVERFLOW;
	147	#endif
	148	tmp.st_size = stat->size;
	149	tmp.st_atime = stat->atime.tv_sec;
	150	tmp.st_mtime = stat->mtime.tv_sec;
	151	tmp.st_ctime = stat->ctime.tv_sec;
	152	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	153	}
	154
	155	asmlinkage long sys_stat(char __user * filename, struct __old_kernel_stat __user * statbuf)
	156	{
	157	struct kstat stat;
5590ff0d	158	int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
1da177e4 LT	159
	160	if (!error)
	161	error = cp_old_stat(&stat, statbuf);
	162
	163	return error;
	164	}
	165	asmlinkage long sys_lstat(char __user * filename, struct __old_kernel_stat __user * statbuf)
	166	{
	167	struct kstat stat;
5590ff0d	168	int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
1da177e4 LT	169
	170	if (!error)
	171	error = cp_old_stat(&stat, statbuf);
	172
	173	return error;
	174	}
	175	asmlinkage long sys_fstat(unsigned int fd, struct __old_kernel_stat __user * statbuf)
	176	{
	177	struct kstat stat;
	178	int error = vfs_fstat(fd, &stat);
	179
	180	if (!error)
	181	error = cp_old_stat(&stat, statbuf);
	182
	183	return error;
	184	}
	185
	186	#endif /* __ARCH_WANT_OLD_STAT */
	187
	188	static int cp_new_stat(struct kstat stat, struct stat __user statbuf)
	189	{
	190	struct stat tmp;
	191
	192	#if BITS_PER_LONG == 32
	193	if (!old_valid_dev(stat->dev) \|\| !old_valid_dev(stat->rdev))
	194	return -EOVERFLOW;
	195	#else
	196	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	197	return -EOVERFLOW;
	198	#endif
	199
	200	memset(&tmp, 0, sizeof(tmp));
	201	#if BITS_PER_LONG == 32
	202	tmp.st_dev = old_encode_dev(stat->dev);
	203	#else
	204	tmp.st_dev = new_encode_dev(stat->dev);
	205	#endif
	206	tmp.st_ino = stat->ino;
afefdbb2 DH	207	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	208	return -EOVERFLOW;
1da177e4 LT	209	tmp.st_mode = stat->mode;
	210	tmp.st_nlink = stat->nlink;
	211	if (tmp.st_nlink != stat->nlink)
	212	return -EOVERFLOW;
	213	SET_UID(tmp.st_uid, stat->uid);
	214	SET_GID(tmp.st_gid, stat->gid);
	215	#if BITS_PER_LONG == 32
	216	tmp.st_rdev = old_encode_dev(stat->rdev);
	217	#else
	218	tmp.st_rdev = new_encode_dev(stat->rdev);
	219	#endif
	220	#if BITS_PER_LONG == 32
	221	if (stat->size > MAX_NON_LFS)
	222	return -EOVERFLOW;
	223	#endif
	224	tmp.st_size = stat->size;
	225	tmp.st_atime = stat->atime.tv_sec;
	226	tmp.st_mtime = stat->mtime.tv_sec;
	227	tmp.st_ctime = stat->ctime.tv_sec;
	228	#ifdef STAT_HAVE_NSEC
	229	tmp.st_atime_nsec = stat->atime.tv_nsec;
	230	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	231	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	232	#endif
	233	tmp.st_blocks = stat->blocks;
	234	tmp.st_blksize = stat->blksize;
	235	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	236	}
	237
5590ff0d UD	238	asmlinkage long sys_newstat(char __user filename, struct stat __user statbuf)
	239	{
	240	struct kstat stat;
	241	int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
	242
	243	if (!error)
	244	error = cp_new_stat(&stat, statbuf);
	245
	246	return error;
	247	}
	248
	249	asmlinkage long sys_newlstat(char __user filename, struct stat __user statbuf)
1da177e4 LT	250	{
1da177e4 LT	251	struct kstat stat;
5590ff0d	252	int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
1da177e4 LT	253
	254	if (!error)
	255	error = cp_new_stat(&stat, statbuf);
	256
	257	return error;
	258	}
5590ff0d	259
2833c28a	260	#if !defined(__ARCH_WANT_STAT64) \|\| defined(__ARCH_WANT_SYS_NEWFSTATAT)
5590ff0d UD	261	asmlinkage long sys_newfstatat(int dfd, char __user *filename,
5590ff0d UD	262	struct stat __user *statbuf, int flag)
1da177e4 LT	263	{
1da177e4 LT	264	struct kstat stat;
5590ff0d UD	265	int error = -EINVAL;
	266
	267	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
	268	goto out;
	269
	270	if (flag & AT_SYMLINK_NOFOLLOW)
	271	error = vfs_lstat_fd(dfd, filename, &stat);
	272	else
	273	error = vfs_stat_fd(dfd, filename, &stat);
1da177e4 LT	274
	275	if (!error)
	276	error = cp_new_stat(&stat, statbuf);
	277
5590ff0d	278	out:
1da177e4 LT	279	return error;
1da177e4 LT	280	}
cff2b760	281	#endif
5590ff0d UD	282
5590ff0d UD	283	asmlinkage long sys_newfstat(unsigned int fd, struct stat __user *statbuf)
1da177e4 LT	284	{
	285	struct kstat stat;
	286	int error = vfs_fstat(fd, &stat);
	287
	288	if (!error)
	289	error = cp_new_stat(&stat, statbuf);
	290
	291	return error;
	292	}
	293
5590ff0d UD	294	asmlinkage long sys_readlinkat(int dfd, const char __user *path,
5590ff0d UD	295	char __user *buf, int bufsiz)
1da177e4 LT	296	{
	297	struct nameidata nd;
	298	int error;
	299
	300	if (bufsiz <= 0)
	301	return -EINVAL;
	302
5590ff0d	303	error = __user_walk_fd(dfd, path, 0, &nd);
1da177e4 LT	304	if (!error) {
	305	struct inode * inode = nd.dentry->d_inode;
	306
	307	error = -EINVAL;
	308	if (inode->i_op && inode->i_op->readlink) {
	309	error = security_inode_readlink(nd.dentry);
	310	if (!error) {
	311	touch_atime(nd.mnt, nd.dentry);
	312	error = inode->i_op->readlink(nd.dentry, buf, bufsiz);
	313	}
	314	}
	315	path_release(&nd);
	316	}
	317	return error;
	318	}
	319
5590ff0d UD	320	asmlinkage long sys_readlink(const char __user path, char __user buf,
	321	int bufsiz)
	322	{
	323	return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
	324	}
	325
1da177e4 LT	326
	327	/* ---------- LFS-64 ----------- */
	328	#ifdef __ARCH_WANT_STAT64
	329
	330	static long cp_new_stat64(struct kstat stat, struct stat64 __user statbuf)
	331	{
	332	struct stat64 tmp;
	333
	334	memset(&tmp, 0, sizeof(struct stat64));
	335	#ifdef CONFIG_MIPS
	336	/* mips has weird padding, so we don't get 64 bits there */
	337	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	338	return -EOVERFLOW;
	339	tmp.st_dev = new_encode_dev(stat->dev);
	340	tmp.st_rdev = new_encode_dev(stat->rdev);
	341	#else
	342	tmp.st_dev = huge_encode_dev(stat->dev);
	343	tmp.st_rdev = huge_encode_dev(stat->rdev);
	344	#endif
	345	tmp.st_ino = stat->ino;
afefdbb2 DH	346	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	347	return -EOVERFLOW;
1da177e4 LT	348	#ifdef STAT64_HAS_BROKEN_ST_INO
	349	tmp.__st_ino = stat->ino;
	350	#endif
	351	tmp.st_mode = stat->mode;
	352	tmp.st_nlink = stat->nlink;
	353	tmp.st_uid = stat->uid;
	354	tmp.st_gid = stat->gid;
	355	tmp.st_atime = stat->atime.tv_sec;
	356	tmp.st_atime_nsec = stat->atime.tv_nsec;
	357	tmp.st_mtime = stat->mtime.tv_sec;
	358	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	359	tmp.st_ctime = stat->ctime.tv_sec;
	360	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	361	tmp.st_size = stat->size;
	362	tmp.st_blocks = stat->blocks;
	363	tmp.st_blksize = stat->blksize;
	364	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	365	}
	366
	367	asmlinkage long sys_stat64(char __user * filename, struct stat64 __user * statbuf)
	368	{
	369	struct kstat stat;
	370	int error = vfs_stat(filename, &stat);
	371
	372	if (!error)
	373	error = cp_new_stat64(&stat, statbuf);
	374
	375	return error;
	376	}
	377	asmlinkage long sys_lstat64(char __user * filename, struct stat64 __user * statbuf)
	378	{
	379	struct kstat stat;
	380	int error = vfs_lstat(filename, &stat);
	381
	382	if (!error)
	383	error = cp_new_stat64(&stat, statbuf);
	384
	385	return error;
	386	}
	387	asmlinkage long sys_fstat64(unsigned long fd, struct stat64 __user * statbuf)
	388	{
	389	struct kstat stat;
	390	int error = vfs_fstat(fd, &stat);
	391
	392	if (!error)
	393	error = cp_new_stat64(&stat, statbuf);
	394
	395	return error;
	396	}
	397
cff2b760 UD	398	asmlinkage long sys_fstatat64(int dfd, char __user *filename,
	399	struct stat64 __user *statbuf, int flag)
	400	{
	401	struct kstat stat;
	402	int error = -EINVAL;
	403
	404	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
	405	goto out;
	406
	407	if (flag & AT_SYMLINK_NOFOLLOW)
	408	error = vfs_lstat_fd(dfd, filename, &stat);
	409	else
	410	error = vfs_stat_fd(dfd, filename, &stat);
	411
	412	if (!error)
	413	error = cp_new_stat64(&stat, statbuf);
	414
	415	out:
	416	return error;
	417	}
1da177e4 LT	418	#endif /* __ARCH_WANT_STAT64 */
	419
	420	void inode_add_bytes(struct inode *inode, loff_t bytes)
	421	{
	422	spin_lock(&inode->i_lock);
	423	inode->i_blocks += bytes >> 9;
	424	bytes &= 511;
	425	inode->i_bytes += bytes;
	426	if (inode->i_bytes >= 512) {
	427	inode->i_blocks++;
	428	inode->i_bytes -= 512;
	429	}
	430	spin_unlock(&inode->i_lock);
	431	}
	432
	433	EXPORT_SYMBOL(inode_add_bytes);
	434
	435	void inode_sub_bytes(struct inode *inode, loff_t bytes)
	436	{
	437	spin_lock(&inode->i_lock);
	438	inode->i_blocks -= bytes >> 9;
	439	bytes &= 511;
	440	if (inode->i_bytes < bytes) {
	441	inode->i_blocks--;
	442	inode->i_bytes += 512;
	443	}
	444	inode->i_bytes -= bytes;
	445	spin_unlock(&inode->i_lock);
	446	}
	447
	448	EXPORT_SYMBOL(inode_sub_bytes);
	449
	450	loff_t inode_get_bytes(struct inode *inode)
	451	{
	452	loff_t ret;
	453
	454	spin_lock(&inode->i_lock);
	455	ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
	456	spin_unlock(&inode->i_lock);
	457	return ret;
	458	}
	459
	460	EXPORT_SYMBOL(inode_get_bytes);
	461
	462	void inode_set_bytes(struct inode *inode, loff_t bytes)
	463	{
	464	/* Caller is here responsible for sufficient locking
	465	* (ie. inode->i_lock) */
	466	inode->i_blocks = bytes >> 9;
	467	inode->i_bytes = bytes & 511;
	468	}
	469
	470	EXPORT_SYMBOL(inode_set_bytes);